Earlier quoted context omitted.
Yep. And even the people with college will necessarily compare less favorably with that older cohort over time. In a world where everyone has a college degree, well, some people with college degrees will have to be the ditch diggers so to speak. I don't know how you solve that problem? It's just math.
Use your educated populace to design robots to dig ditches. It's not "math" that humans have to engage in undesirable labor, under brutal conditions. We have thousands of years of developing tools that are contrary to that statement. It is a collective social decision to say that an hour of someone's time is worth less than building a robot. That's the only reason why cashiers still exist.
If you go that route, then the people who build and program the robots will necessarily be paid less. Today that is likely a top 10% job. (More likely a top 5% job if we're being honest.) In a world where everyone has a college degree and there are 30 times the number of people who can program those things because the tools have gotten just that easy...
well, you do the math.
At the extreme, you can't just pay 100% of the labor market more money because they have a college degree. It just doesn't work like that.
Put in more base terms, there is only room for 1% of the people, in the top 1%. You may be able to, through the magic of increased production, decrease the price of everything in your economy. So that the other 99% of people can afford access to everything to which people in the top 1% have access. But even that is difficult in the extreme. It'd just be easier, over time, than is paying everyone in your economy more over time.